Multiple Choice
Which of the following represents the total number of sex chromosomes typically found in a human somatic (body) cell?
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3. Extensions to Mendelian Inheritance
Sex Chromosome
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Which of the following genotypes represents the presence of the Rh (rhesus) protein on red blood cells?
A
XY
B
XX
C
Rh-Rh-
D
Rh+Rh+
Verified step by step guidance1
Understand that the Rh (Rhesus) protein presence on red blood cells is determined by the Rh gene, which has two main alleles: Rh+ (dominant) and Rh- (recessive).
Recognize that genotypes involving 'XY' and 'XX' refer to sex chromosomes and are unrelated to the Rh protein expression.
Focus on the genotype notation related to the Rh gene, where 'Rh+Rh+' indicates homozygous dominant, 'Rh+Rh-' indicates heterozygous, and 'Rh-Rh-' indicates homozygous recessive.
Recall that the presence of the Rh protein requires at least one dominant Rh+ allele, so both 'Rh+Rh+' and 'Rh+Rh-' genotypes express the Rh protein on red blood cells.
Conclude that the genotype 'Rh+Rh+' represents the presence of the Rh protein, while 'Rh-Rh-' represents its absence.
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